Sinfield embarked on the 7 in 7: Together challenge on Monday in what was his sixth annual fundraiser to support the MND community after Burrow was diagnosed with the incurable and life-limiting disease in 2019.
He has already raised more than £10m towards research into the disease and support for families affected by it – and has passed his target of raising £777,777 for MND charities with this year’s challenge.
As of Saturday afternoon, Sinfield had raised more than £1m, which will be donated to six MND charities.
The 7 in 7 challenges derive their name from Burrow’s old shirt number
Prince William wrote: “Kevin, huge congratulations on nearing the finish of your incredible 7 in 7 challenge!
“Your commitment to Rob and everyone affected by MND is truly inspiring.
“Thank you for shining a light on the need for research and support, and for the hope and example you bring. Look after those knees! W.”
